Duration of Treatment and Follow up Active treatment is limited to the hours while the patient is in the cardiac catheterization laboratory. Patients will be followed up to 7 days post intervention. They will be asked to provide urine and/or blood samples collected at baseline, pre-catheterization, 2 6, 24, and 48-72 hours post-angiography. They will be followed up by telephone at 7 days post intervention to determine if they experienced any adverse events related to the procedure or the intervention.